Floristik, Geographie, Horticultur und Systematik etc. 183 



certain rhizomes the mestome-strands were collatcral near the 

 periphery, but leptocentric in the innermost bands. 



Much variet}" is shown in the structure of the leaves. In Com- 

 melina, Weldenia and Trad. Warcsewicziana the leaves are bifacial; 

 they are almost bifacial in Tvad. Virgiv.ica , but isolateral in some 

 of the others e. g. Trad. Floridmia, T. Scopidonitn , Aneilema cet. 

 The pneumatic tissue attains its highest development in Weldenia 

 and Trad. Warcs. Strands of collenchyma usually accompan}^ the 

 veins, while stereome was less frequently observed. A waterstorage- 

 tissue of several strata is well developed in most of these species; 

 it Covers the entire ventral face of the leaf in Trad. Warcs. ^ besides 

 that it is \'Qxy amply represented on the dorsal face, but interrupted 

 by strata of chloren chj^ma; it is, furthermore, highly developed in 

 Weldenia, Aneilema and Trad. rosea. 



Much Variation is exhibited by epidermis; several and very 

 distinct tj^pes of hairs occur in these plants. The stomata shoAV several 

 moditications in regard to the subsidiary cells; while all the Coni- 

 rnelinae have two pairs of subsidiary cells; the Tradescantiae , with 

 the only exception of T. Floridana , have only one pair. Several of 

 these plants show a wide distribution and inhabit localities of a very 

 different nature; the same species may occur in dr}- ground as well 

 as in rieh soil, in woods, on riverbanks etc. It would, therefore, be 

 somewhat difficul*^ to give an exact Classification of several of these 

 Commelinaceae as Hydrophytes, Xerophytes or Mesophytes. Moreover 

 their structure does' not alwa\"s seem to be in correspondance with 

 the nature of the habitat; some species seem, indeed, to be very 

 independent. The family is altogether very little known as far as 

 concerns the internal structure, thus it is not yet possible to draw 

 the distinction between such characters as may be regarded as 

 epharmonic and such as may be those of the famih". However the 

 collenchymatic tissue may evidently be one of the characters of the 

 family, while the water-storage-tissue may represent merely an 

 epharmonic. Theo. Holm. 



Holm, Theo., Eriophorum ntsseolum Fr. versus E. Chamissonis 

 Mey. (Ottowa Naturalist 1906. XX. p. 62.) 



In proposing the change of name of E. russeolum to E. Chainissoiiis 

 Mr. Fernald has overlooked a note by Elias Fries, published in 

 Bot. Not. 1844, in which Fries offers the ver}?- important Statement 

 that Meyer himself, in litteris, has acknowfedged the identity of 

 his plant (E. Chamissonis) with that of E. capitatum , thus the name 

 of Fries was applied to a plant very distinct from what is known now 

 as E. capitatum , instead of being a synon^^m of Me^'er's E. Chamisso)iis. 



Theo. Holm. 



Holm, Theo. On the etymologv of plant-names. (Ontario Nat. 

 Sc. Bull. 1906. p. 25—30. 



In some recently published works on the Flora of North America 

 the derivation of the plant-names has been given, and the writer 

 enumerates and corrects ä number of instances, where tl^e derivation 

 is absolutety incorrect. The mistakes are mostly due to explaining 

 the names b}^ means of translating these from Latin , when the names 

 are reallv in Greek or vice versa. When names are made bv latini- 



